Claude Opus 5.5, launched September 22, is still Anthropic's newest Opus model

Anthropic's official records show Claude Opus 5.5 launched on September 22, 2026, priced at $4 / $20 per million input and output tokens. Its developer notes list the model as available on the Claude API and on Amazon Bedrock, Google Cloud and Microsoft Foundry. The company's news page, checked on November 6, still leads with that announcement. That matters because the question needs a model named Opus and numbered 5.6 or higher. Opus 5.5 does not count, and neither does any rollout or snapshot of it. The forecast leans toward no such release by November 30 because the latest Anthropic records I can see show nothing past 5.5. The developer notes carry an entry dated November 5, 2026, but the excerpt does not say what it covers. Anthropic's own documents show how quickly the Opus line has moved. Opus 5 is described as a step change over Opus 4.8, and a later safety document says Opus 5 was released publicly after July 15, 2026. That document gives no launch date, so I will not draw a rhythm from it. A faster release would not be a surprise, but the supplied records give no sign of a 5.6 or a Opus 6 being close. The same documents mention other frontier models, including Claude Mythos 5 and Claude Fable 5. They are not Opus models and would not qualify. The thing to watch is any new Opus entry on Anthropic's news page or developer release notes, carrying a version number above 5.5 and open general access.